EP1795768B1 - Thread tapping screw, in particular concrete screw - Google Patents

Thread tapping screw, in particular concrete screw Download PDF

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Publication number
EP1795768B1
EP1795768B1 EP06021822A EP06021822A EP1795768B1 EP 1795768 B1 EP1795768 B1 EP 1795768B1 EP 06021822 A EP06021822 A EP 06021822A EP 06021822 A EP06021822 A EP 06021822A EP 1795768 B1 EP1795768 B1 EP 1795768B1
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EP
European Patent Office
Prior art keywords
thread
screw
self
core
tapping screw
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
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EP06021822A
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German (de)
French (fr)
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EP1795768A1 (en
Inventor
Jan-Christian Becker
Marc Schäffer
Raphael Dixa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fischerwerke GmbH and Co KG
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Fischerwerke GmbH and Co KG
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Application filed by Fischerwerke GmbH and Co KG filed Critical Fischerwerke GmbH and Co KG
Priority to PL06021822T priority Critical patent/PL1795768T3/en
Publication of EP1795768A1 publication Critical patent/EP1795768A1/en
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Publication of EP1795768B1 publication Critical patent/EP1795768B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/001—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed
    • F16B25/0026—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed the material being a hard non-organic material, e.g. stone, concrete or drywall
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/0036—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw
    • F16B25/0084—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by geometric details of the tip

Definitions

  • the invention relates to a thread-cutting screw, in particular a concrete screw, with the features of the preamble of claim 1.
  • Such screws are from the WO 02/12736 or the US 4,673,323 known.
  • the invention has for its object to reduce the insertion torque of a self-tapping screw, in particular a concrete screw when screwing into a wellbore in a hard solid building material such as concrete.
  • the screw according to the invention has at least one, preferably a plurality of grooves which extend in a longitudinal direction of the screw and pass through the thread.
  • the grooves form the breaks and the cutting edges of the thread.
  • the grooves are so deep that they reach into the thread core of the screw.
  • the thread core is conically shaped in a front region of the screw.
  • the depth of the grooves decreases from the front end of the screw to the end of the conical region of the thread core.
  • the grooves form pockets for receiving rock flour, which is referred to by the solid material when cutting the thread separated material. Even after drilling in the borehole remaining rock flour is absorbed in the grooves.
  • the grooves prevent rock flour from becoming a gap between a borehole wall and the thread core of the screw added, ie completely fills and increases the friction when screwing the screw. The insertion torque of the screw according to the invention is thereby reduced.
  • the grooves do not have to be straight and paraxial, but can for example also run helically. If there are several grooves, they do not have to be distributed equidistantly over the circumference. There are preferably several, for example, provided between two and four grooves, on the one hand to increase the number of cutting edges on the thread and on the other to increase the available volume for receiving rock flour.
  • the grooves are present only in a front region of the screw, ie at the end with which the screw is screwed into the well ahead. Further windings of the thread are not interrupted in this embodiment of the invention, whereby a load capacity of the screw is increased. Since the thread is cut into the Vollbaustoff of the front turns of the thread of the screw, no cuts and consequently no interruptions of the thread are necessary to the windings located further back.
  • the invention provides that the grooves (only) pass through the turns in which the thread does not yet have the largest outer diameter. It can also be one or two more turns of the same thread penetrated by the grooves, which already have the largest outer thread diameter.
  • An embodiment of the invention provides that the turns of the thread on the thread foot axially spaced from each other.
  • a thread pitch can be about the size of a thread core diameter. This has proven to be favorable for a low insertion torque of the screw.
  • the axial distance of the turns from each other causes a receiving space for rock flour.
  • the screw shown in the drawing according to the invention is a thread-cutting concrete screw 1. It has a shaft 2 and a screw head 3.
  • the screw shaft 2 has a thread 4 with a thread core 5 and a threadless shank portion 6.
  • the thread 4 has two threads 7, 8, which, however, is not mandatory for the invention.
  • Both threads 7, 8 have a sawtooth-shaped cross-section, whose flatter and longer flank faces the screw head 3.
  • the two threads 7, 8 have different heights, they have different outer diameter.
  • their axial distance is different from each other.
  • a pitch of the concrete screw 1, i. the axial distance between two successive turns of a thread 7; 8 is slightly larger than a diameter of the thread core. 5
  • the thread core 5 tapers conically. In this area, the outer diameter of the threads 7, 8 decreases in accordance with the cone. A height of the threads 7, 8 can decrease in the conical region of the threaded core 5 or remain the same.
  • the thread core 5 In the conical region of the thread core 5, ie in the front region of the concrete screw 1, the thread core 5 has longitudinal grooves 9 which pass through the threads 7, 8. A depth of the grooves 9 decreases from the front end of the concrete screw 1 to the end of the conical portion of the threaded core 5, in the region of a transition from the conical portion to a cylindrical portion of the Threaded core 5 ends the longitudinal grooves 9.
  • the concrete screw 1 four longitudinal grooves 9 which are arranged distributed equidistantly over the circumference. Another number and / or a different distribution of the longitudinal grooves 9 is possible.
  • a hole in the solid construction material is mounted, whose diameter corresponds approximately to an outer diameter of the thread 8 with the smaller outer diameter.
  • the diameter of the borehole is thus larger than the diameter of the thread core 5 and smaller than an outer diameter of the thread 7 with the larger outer diameter.
  • the concrete screw 1 is preferably screwed into the borehole using an impact wrench, which applies rotational shocks to the concrete screw 1.
  • the longitudinal grooves 9 form pockets for receiving rock flour between the threaded core 5 and the wall of the borehole. Such rock flour falls when cutting the thread in the solid building material.
  • rock flour from drilling the wellbore may be present if the wellbore has not been thoroughly cleaned.
  • the longitudinal grooves 9 avoid that a gap between the wall of the borehole and the thread core 5 in the front region of the concrete screw 1, in which the blades 10 are located and in which falls when cutting the thread rock flour, added with rock flour.
  • the clogging of the gap between the thread core 5 and the wall of the well with rock flour would result in a higher friction which would increase the insertion torque of the concrete screw 1 and increase the risk of a screw breakage.
  • the longitudinal grooves 9 are wider than the remaining between them peripheral portions of the threads 7, 8. In the region in which the threads 7, 8 are interrupted by the longitudinal grooves 9, the threads 7, 8 extend only a short distance in the circumferential direction. This has proven to be favorable for cutting the thread in the solid construction material. In addition, the thus wide longitudinal grooves 9 on a large volume for receiving the rock flour.

Abstract

A thread (4) on a thread core (5) terminates in cuts (10) that form interruptions at the screw end. Grooves (9) running in the longitudinal direction of the screw are formed deeper than the thread and comprise the interruptions.

Description

Die Erfindung betrifft eine gewindeschneidende Schraube, insbesondere eine Betonschraube, mit den Merkmalen des Oberbegriffs des Anspruchs 1. Solche Schrauben sind aus der WO 02/12736 oder der US 4,673,323 bekannt.The invention relates to a thread-cutting screw, in particular a concrete screw, with the features of the preamble of claim 1. Such screws are from the WO 02/12736 or the US 4,673,323 known.

Zur Verankerung einer Schraube in einem harten Vollbaustoff wie beispielsweise Beton ist die Verwendung eines Dübels üblich. Aus der DE 297 04 226 U1 ist eine alternative Schraube bekannt, die ohne Verwendung eines Dübels in ein Bohrloch in Beton eindrehbar ist. Der Bohrlochdurchmesser ist größer als ein Gewindekerndurchmesser und kleiner als ein Gewindeaußendurchmesser der Schraube. Zum Eindrehen der Schraube ist ein Schlagschrauber notwendig, der die Schraube mit Drehschlägen beaufschlagt. Das Gewinde der bekannten Schraube ist von Unterbrechungen durchsetzt, die Schneiden bilden. Die Unterbrechungen sind weniger tief als das Gewinde hoch ist, die Unterbrechungen reichen nicht bis zum Gewindekern. Die Schneiden ermöglichen das Schneiden eines Gewindes in den Beton beim Eindrehen der Schraube in das zuvor gebohrte Loch. Die Schraube schneidet sich ihr Gewinde selbst.To anchor a screw in a hard solid building material such as concrete, the use of a dowel is common. From the DE 297 04 226 U1 An alternative screw is known which can be screwed into a borehole in concrete without the use of a dowel. The hole diameter is larger than a thread core diameter and smaller than an outside thread diameter of the screw. To screw in the screw an impact wrench is necessary, which acts on the screw with rotational strokes. The thread of the known screw is interspersed with interruptions that form cutting edges. The interruptions are less deep than the thread is high, the interruptions are not enough to the thread core. The blades allow the cutting of a thread in the concrete when screwing the screw into the previously drilled hole. The screw cuts its thread itself.

Der Erfindung liegt die Aufgabe zugrunde, das Eindrehmoment einer gewindeschneidenden Schraube, insbesondere einer Betonschraube, beim Eindrehen in ein Bohrloch in einem harten Vollbaustoff wie Beton zu verringern.The invention has for its object to reduce the insertion torque of a self-tapping screw, in particular a concrete screw when screwing into a wellbore in a hard solid building material such as concrete.

Diese Aufgabe wird erfindungsgemäß durch die Merkmale des Anspruchs 1 gelöst. Wie beim Stand der Technik weist die erfindungsgemäße Schraube mindestens eine, vorzugsweise mehrere Nuten auf, die in einer Längsrichtung der Schraube verlaufen und das Gewinde durchsetzen. Die Nuten bilden die Unterbrechungen und die Schneiden des Gewindes. Dabei sind die Nuten so tief, dass sie bis in den Gewindekern der Schraube reichen. Der Gewindekern ist in einem vorderen Bereich der Schraube konisch geformt. Erfindungsgemäß nimmt die Tiefe der Nuten vom vorderen Ende der Schraube zum Ende des konischen Bereichs des Gewindekerns ab. Dadurch bilden die Nuten Taschen zur Aufnahme von Gesteinsmehl, womit vom Vollbaustoff beim Schneiden des Gewindes abgetrenntes Material bezeichnet ist. Auch nach dem Bohren im Bohrloch verbliebenes Gesteinsmehl wird in den Nuten aufgenommen. Die Nuten vermeiden, dass Gesteinsmehl einen Zwischenraum zwischen einer Bohrlochwand und dem Gewindekern der Schraube zusetzt, d.h. vollständig ausfüllt und die Reibung beim Eindrehen der Schraube erhöht. Das Eindrehmoment der erfindungsgemäßen Schraube ist dadurch verringert.This object is achieved by the features of claim 1. As in the prior art, the screw according to the invention has at least one, preferably a plurality of grooves which extend in a longitudinal direction of the screw and pass through the thread. The grooves form the breaks and the cutting edges of the thread. The grooves are so deep that they reach into the thread core of the screw. The thread core is conically shaped in a front region of the screw. According to the invention, the depth of the grooves decreases from the front end of the screw to the end of the conical region of the thread core. As a result, the grooves form pockets for receiving rock flour, which is referred to by the solid material when cutting the thread separated material. Even after drilling in the borehole remaining rock flour is absorbed in the grooves. The grooves prevent rock flour from becoming a gap between a borehole wall and the thread core of the screw added, ie completely fills and increases the friction when screwing the screw. The insertion torque of the screw according to the invention is thereby reduced.

Die Nuten müssen nicht gerade und achsparallel, sondern können beispielsweise auch wendelförmig verlaufen. Sind mehrere Nuten vorhanden, müssen diese nicht äquidistant über den Umfang verteilt angeordnet sein. Es sind vorzugsweise mehrere, beispielsweise zwischen zwei und vier Nuten vorgesehen, um zum Einen die Anzahl der Schneiden am Gewinde zu erhöhen und zum Anderen das zur Aufnahme von Gesteinsmehl verfügbare Volumen zu vergrößern.The grooves do not have to be straight and paraxial, but can for example also run helically. If there are several grooves, they do not have to be distributed equidistantly over the circumference. There are preferably several, for example, provided between two and four grooves, on the one hand to increase the number of cutting edges on the thread and on the other to increase the available volume for receiving rock flour.

In bevorzugter Ausgestaltung der Erfindung sind die Nuten nur in einem vorderen Bereich der Schraube vorhanden, also an dem Ende, mit dem voraus die Schraube in das Bohrloch eingedreht wird. Weiter hinten liegende Windungen des Gewindes sind bei dieser Ausgestaltung der Erfindung nicht unterbrochen, wodurch eine Tragfähigkeit der Schraube erhöht ist. Da das Gewinde in den Vollbaustoff von den vorderen Windungen des Gewindes der Schraube geschnitten wird, sind an den weiter hinten befindlichen Windungen keine Schneiden und demzufolge auch keine Unterbrechungen des Gewindes notwendig. Insbesondere sieht die Erfindung vor, dass die Nuten (nur) die Windungen durchsetzen, in denen das Gewinde noch nicht den größten Außendurchmesser aufweist. Es können auch ein oder zwei weitere Windungen desselben Gewindegangs von den Nuten durchsetzt sein, die bereits den größten Gewindeaußendurchmesser aufweisen.In a preferred embodiment of the invention, the grooves are present only in a front region of the screw, ie at the end with which the screw is screwed into the well ahead. Further windings of the thread are not interrupted in this embodiment of the invention, whereby a load capacity of the screw is increased. Since the thread is cut into the Vollbaustoff of the front turns of the thread of the screw, no cuts and consequently no interruptions of the thread are necessary to the windings located further back. In particular, the invention provides that the grooves (only) pass through the turns in which the thread does not yet have the largest outer diameter. It can also be one or two more turns of the same thread penetrated by the grooves, which already have the largest outer thread diameter.

Eine Ausgestaltung der Erfindung sieht vor, dass die Windungen des Gewindes am Gewindefuß axialen Abstand voneinander aufweisen. Eine Gewindesteigung kann ungefähr so groß wie ein Gewindekerndurchmesser sein. Dies hat sich als günstig für ein niedriges Eindrehmoment der Schraube herausgestellt. Der axiale Abstand der Windungen voneinander bewirkt einen Aufnahmeraum für Gesteinsmehl.An embodiment of the invention provides that the turns of the thread on the thread foot axially spaced from each other. A thread pitch can be about the size of a thread core diameter. This has proven to be favorable for a low insertion torque of the screw. The axial distance of the turns from each other causes a receiving space for rock flour.

Die Erfindung wird nachfolgend anhand eines in der Zeichnung dargestellten Ausführungsbeispiels näher erläutert. Es zeigen:

Figuren 1 und 2:
eine erfindungsgemäße Schraube in perspektivischer Darstellung aus zwei verschiedenen Blickrichtungen; und
Figur 3
eine größere Darstellung eines vorderen Bereichs der Schraube aus Figuren 1 und 2.
The invention will be explained in more detail with reference to an embodiment shown in the drawing. Show it:
FIGS. 1 and 2:
a screw according to the invention in a perspective view from two different directions of view; and
FIG. 3
a larger view of a front portion of the screw Figures 1 and 2 ,

Die in der Zeichnung dargestellte, erfindungsgemäße Schraube ist eine gewindeschneidende Betonschraube 1. Sie weist einen Schaft 2 und einen Schraubenkopf 3 auf. Der Schraubenschaft 2 weist ein Gewinde 4 mit einem Gewindekern 5 und einen gewindelosen Schaftabschnitt 6 auf. Im dargestellten und beschriebenen Ausführungsbeispiel der Erfindung weist das Gewinde 4 zwei Gewindegänge 7, 8 auf, was allerdings nicht zwingend für die Erfindung ist. Beide Gewindegänge 7, 8 weisen einen sägezahnförmigen Querschnitt auf, dessen flachere und längere Flanke dem Schraubenkopf 3 zugewandt ist. Die beiden Gewindegänge 7, 8 sind unterschiedlich hoch, sie weisen verschiedene Außendurchmesser auf. Außerdem ist ihr axialer Abstand voneinander verschieden. Eine Steigung der Betonschraube 1, d.h. der axiale Abstand zweier aufeinander folgender Windungen eines Gewindegangs 7; 8 ist etwas größer als ein Durchmesser des Gewindekerns 5.The screw shown in the drawing according to the invention is a thread-cutting concrete screw 1. It has a shaft 2 and a screw head 3. The screw shaft 2 has a thread 4 with a thread core 5 and a threadless shank portion 6. In the illustrated and described embodiment of the invention, the thread 4 has two threads 7, 8, which, however, is not mandatory for the invention. Both threads 7, 8 have a sawtooth-shaped cross-section, whose flatter and longer flank faces the screw head 3. The two threads 7, 8 have different heights, they have different outer diameter. In addition, their axial distance is different from each other. A pitch of the concrete screw 1, i. the axial distance between two successive turns of a thread 7; 8 is slightly larger than a diameter of the thread core. 5

An einem vorderen, d.h. dem Schraubenkopf 3 fernen Ende verjüngt sich der Gewindekern 5 konisch. In diesem Bereich verkleinert sich der Außendurchmesser der Gewindegänge 7, 8 entsprechend dem Konus. Eine Höhe der Gewindegänge 7, 8 kann im konischen Bereich des Gewindekerns 5 abnehmen oder gleich bleiben.At a front, i. the screw head 3 far end, the thread core 5 tapers conically. In this area, the outer diameter of the threads 7, 8 decreases in accordance with the cone. A height of the threads 7, 8 can decrease in the conical region of the threaded core 5 or remain the same.

Im konischen Bereich des Gewindekerns 5, also im vorderen Bereich der Betonschraube 1, weist der Gewindekern 5 Längsnuten 9 auf, die die Gewindegänge 7, 8 durchsetzen. Die Längsnuten 9 bilden Unterbrechungen der Gewindegänge 7, 8 und bilden zugleich Schneiden 10. Eine Tiefe der Nuten 9 nimmt vom vorderen Ende der Betonschraube 1 zum Ende des konischen Bereichs des Gewindekerns 5 ab, im Bereich eines Übergangs vom konischen Bereich zu einem zylindrischen Bereich des Gewindekerns 5 enden die Längsnuten 9. Im dargestellten und beschriebenen Ausführungsbeispiel der Erfindung weist die Betonschraube 1 vier Längsnuten 9 auf, die äquidistant über den Umfang verteilt angeordnet sind. Eine andere Anzahl und/oder eine andere Verteilung der Längsnuten 9 ist möglich.In the conical region of the thread core 5, ie in the front region of the concrete screw 1, the thread core 5 has longitudinal grooves 9 which pass through the threads 7, 8. A depth of the grooves 9 decreases from the front end of the concrete screw 1 to the end of the conical portion of the threaded core 5, in the region of a transition from the conical portion to a cylindrical portion of the Threaded core 5 ends the longitudinal grooves 9. In the illustrated and described embodiment of the invention, the concrete screw 1 four longitudinal grooves 9 which are arranged distributed equidistantly over the circumference. Another number and / or a different distribution of the longitudinal grooves 9 is possible.

Zur Befestigung in einem harten Vollbaustoff wie beispielsweise Beton wird ein Bohrloch im Vollbaustoff angebracht, dessen Durchmesser in etwa einem Außendurchmesser des Gewindegangs 8 mit dem kleineren Außendurchmesser entspricht. Der Durchmesser des Bohrlochs ist also größer als der Durchmesser des Gewindekerns 5 und kleiner als ein Außendurchmesser des Gewindegangs 7 mit dem größeren Außendurchmesser. Die Betonschraube 1 wird vorzugsweise unter Verwendung eines Schlagschraubers, der Drehschläge auf die Betonschraube 1 ausübt, in das Bohrloch eingedreht. Dabei schneiden die Schneiden 10, die durch die Längsnuten 9 an den Gewindegängen 7, 8 ausgebildet sind, ein komplementäres Gewinde in eine Wand des Bohrlochs im Vollbaustoff. Die Längsnuten 9 bilden Taschen zur Aufnahme von Gesteinsmehl zwischen dem Gewindekern 5 und der Wand des Bohrlochs. Solches Gesteinsmehl fällt beim Schneiden des Gewindes in den Vollbaustoff an. Auch kann Gesteinsmehl vom Bohren des Bohrlochs vorhanden sein, wenn das Bohrloch nicht sorgfältig gereinigt worden ist. Die Längsnuten 9 vermeiden, dass sich ein Zwischenraum zwischen der Wand des Bohrlochs und dem Gewindekern 5 im vorderen Bereich der Betonschraube 1, in dem sich die Schneiden 10 befinden und in dem beim Schneiden des Gewindes Gesteinsmehl anfällt, mit Gesteinsmehl zusetzt. Das Zusetzen des Zwischenraums zwischen dem Gewindekern 5 und der Wand des Bohrlochs mit Gesteinsmehl hätte eine höhere Reibung zur Folge, die das Eindrehmoment der Betonschraube 1 erhöhen und die Gefahr eines Schraubenbruchs vergrößern würde.For attachment in a hard solid building material such as concrete, a hole in the solid construction material is mounted, whose diameter corresponds approximately to an outer diameter of the thread 8 with the smaller outer diameter. The diameter of the borehole is thus larger than the diameter of the thread core 5 and smaller than an outer diameter of the thread 7 with the larger outer diameter. The concrete screw 1 is preferably screwed into the borehole using an impact wrench, which applies rotational shocks to the concrete screw 1. The cutting edges 10, which are formed by the longitudinal grooves 9 on the threads 7, 8, cut a complementary thread in a wall of the wellbore in Vollbaustoff. The longitudinal grooves 9 form pockets for receiving rock flour between the threaded core 5 and the wall of the borehole. Such rock flour falls when cutting the thread in the solid building material. Also, rock flour from drilling the wellbore may be present if the wellbore has not been thoroughly cleaned. The longitudinal grooves 9 avoid that a gap between the wall of the borehole and the thread core 5 in the front region of the concrete screw 1, in which the blades 10 are located and in which falls when cutting the thread rock flour, added with rock flour. The clogging of the gap between the thread core 5 and the wall of the well with rock flour would result in a higher friction which would increase the insertion torque of the concrete screw 1 and increase the risk of a screw breakage.

Die Längsnuten 9 sind breiter als die zwischen ihnen verbliebenen Umfangsabschnitte der Gewindegänge 7, 8. In dem Bereich, in dem die Gewindegänge 7, 8 von den Längsnuten 9 unterbrochen sind, erstrecken sich die Gewindegänge 7, 8 nur ein kurzes Stück in Umfangsrichtung. Das hat sich als günstig für das Schneiden des Gewindes in den Vollbaustoff erwiesen. Außerdem weisen die dadurch breiten Längsnuten 9 ein großes Volumen zur Aufnahme des Gesteinsmehls auf.The longitudinal grooves 9 are wider than the remaining between them peripheral portions of the threads 7, 8. In the region in which the threads 7, 8 are interrupted by the longitudinal grooves 9, the threads 7, 8 extend only a short distance in the circumferential direction. This has proven to be favorable for cutting the thread in the solid construction material. In addition, the thus wide longitudinal grooves 9 on a large volume for receiving the rock flour.

Claims (8)

  1. Self-tapping screw, especially a concrete screw, having a thread (4) and a thread core (5), the thread (4) having gaps which create cutters (10), the thread core (5) having a conical form in a forward region of the screw (1) and the screw (1) having a groove (9) which extends in the longitudinal direction of the screw (1), interrupts the thread (4) and forms the gaps and which is deeper than the thread (4) is high, so that it extends into the thread core (5), characterized in that the depth of the groove (9) decreases from the forward end of the screw (1) to the end of the conical region of the thread core (5).
  2. Self-tapping screw according to claim 1, characterized in that the screw (1) has a plurality of grooves (9) distributed around the periphery.
  3. Self-tapping screw according to claim 1, characterized in that the screw (1) has the groove (9) only in a forward region.
  4. Self-tapping screw according to claim 3, characterized in that the screw (1) has the groove (9) only in a forward region in which the thread (4) does not yet have its greatest outer diameter.
  5. Self-tapping screw according to claim 4, characterized in that the groove (9) interrupts one or two further turns of the same screw thread that already have their greatest outer diameter.
  6. Self-tapping screw according to claim 1, characterized in that the gaps in the thread (4) formed by the groove (9) are longer in the peripheral direction than the dimensions of the remaining portions of the thread (4) in the peripheral direction.
  7. Self-tapping screw according to claim 1, characterized in that turns of the thread (4) at the foot of the thread are spaced apart from one another axially.
  8. Self-tapping screw according to claim 7, characterized in that the thread pitch is approximately the same as the diameter of the thread core (5).
EP06021822A 2005-12-07 2006-10-18 Thread tapping screw, in particular concrete screw Not-in-force EP1795768B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL06021822T PL1795768T3 (en) 2005-12-07 2006-10-18 Thread tapping screw, in particular concrete screw

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005058391A DE102005058391A1 (en) 2005-12-07 2005-12-07 Thread cutting screw, especially concrete screw

Publications (2)

Publication Number Publication Date
EP1795768A1 EP1795768A1 (en) 2007-06-13
EP1795768B1 true EP1795768B1 (en) 2008-10-01

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EP06021822A Not-in-force EP1795768B1 (en) 2005-12-07 2006-10-18 Thread tapping screw, in particular concrete screw

Country Status (8)

Country Link
EP (1) EP1795768B1 (en)
CN (1) CN1978924A (en)
AT (1) ATE409814T1 (en)
DE (2) DE102005058391A1 (en)
DK (1) DK1795768T3 (en)
ES (1) ES2314805T3 (en)
PL (1) PL1795768T3 (en)
TW (1) TW200724794A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2233757A2 (en) 2009-03-24 2010-09-29 HILTI Aktiengesellschaft Method for anchoring a mounting element in a mineral component and mounting element for mineral components
DE102010028824A1 (en) 2010-05-10 2011-11-10 Hilti Aktiengesellschaft Thread cutting concrete screw
DE102013203148A1 (en) * 2013-02-26 2014-08-28 Hilti Aktiengesellschaft Manufacturing process for screws and concrete screw
DE102013203151A1 (en) * 2013-02-26 2014-08-28 Hilti Aktiengesellschaft concrete screw
DE102019104783A1 (en) * 2019-02-26 2020-08-27 Adolf Würth GmbH & Co. KG Concrete screw

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ITPV20100004A1 (en) * 2010-03-11 2011-09-12 Carlo Vittorio Sala ANTI-DRIED AND RELATIVE THREAD MOLDING MATRIX, FOR THE FORMATION OF THE THREAD IN THE MADREVITE, THROUGH A MECHANICAL LAMINATION TECHNIQUE WITHOUT THE REMOVAL OF MATERIAL
CN103452992B (en) * 2013-09-17 2016-01-20 上海美固澄梵紧固件有限公司 A kind of crab-bolt
SE538636C2 (en) * 2014-12-12 2016-10-04 Essve Produkter Ab Concrete screw
EP3130811A1 (en) * 2015-08-12 2017-02-15 HILTI Aktiengesellschaft Screw driving-in method
EP3760885A1 (en) * 2019-07-03 2021-01-06 Hilti Aktiengesellschaft Hammer-in concrete screw
DE102020108557A1 (en) * 2019-08-08 2021-02-11 Ludwig Hettich Holding Gmbh & Co. Kg System for fastening an anchor in a mineral substrate

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EP2233757A2 (en) 2009-03-24 2010-09-29 HILTI Aktiengesellschaft Method for anchoring a mounting element in a mineral component and mounting element for mineral components
DE102009001815A1 (en) 2009-03-24 2010-10-07 Hilti Aktiengesellschaft Method for anchoring a fastening element in a mineral component and fastening element for mineral components
DE102010028824A1 (en) 2010-05-10 2011-11-10 Hilti Aktiengesellschaft Thread cutting concrete screw
EP2386770A1 (en) 2010-05-10 2011-11-16 HILTI Aktiengesellschaft Thread cutting concrete screw
US8753056B2 (en) 2010-05-10 2014-06-17 Hilti Aktiengesellschaft Thread-tapping concrete screw
DE102013203148A1 (en) * 2013-02-26 2014-08-28 Hilti Aktiengesellschaft Manufacturing process for screws and concrete screw
DE102013203151A1 (en) * 2013-02-26 2014-08-28 Hilti Aktiengesellschaft concrete screw
DE102019104783A1 (en) * 2019-02-26 2020-08-27 Adolf Würth GmbH & Co. KG Concrete screw

Also Published As

Publication number Publication date
EP1795768A1 (en) 2007-06-13
ES2314805T3 (en) 2009-03-16
ATE409814T1 (en) 2008-10-15
PL1795768T3 (en) 2009-04-30
DE102005058391A1 (en) 2007-06-14
DE502006001669D1 (en) 2008-11-13
CN1978924A (en) 2007-06-13
TW200724794A (en) 2007-07-01
DK1795768T3 (en) 2009-02-02

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